(安卓自学笔记五)photoview的使用

本文介绍如何在Android项目中集成PhotoView库,实现图片缩放和平移功能。文章详细讲解了添加依赖、解决依赖冲突的方法,并提供了布局配置及事件监听器的示例。

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首先添加依赖

compile 'com.github.chrisbanes:PhotoView:1.2.6'

如果依赖文件加载失败就修改gradle

allprojects {
    repositories {
        maven { url "https://jitpack.io" }
        jcenter()
    }
}

如果从出现以下报错

Error:Execution failed for task ':app:transformClassesWithJarMergingForDebug'.

就用exclude去除依赖中多余的部分

compile ('com.github.chrisbanes:PhotoView:1.2.6'){
        exclude module:
            'support-v4'
        exclude group:
                'com.android.support'}

添加成功之后,像Imageview一样去建一个布局

    <uk.co.senab.photoview.PhotoView
        android:id="@+id/iv"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@drawable/bg"
        />

布局怎么样就看自己的喜好了

然后去Activity中注解

private PhotoView iv;
private PhotoViewAttacher ivAttacher;
iv=(PhotoView)findViewById(R.id.iv);
ivAttacher= new PhotoViewAttacher(iv);

和Imageview不一样的地方是,多了一个attacher来管理photoview

可以通过它来添加点击监听器

ivAttacher.setOnPhotoTapListener(new PhotoViewAttacher.OnPhotoTapListener(){
            @Override
            public void onPhotoTap(View view, float v, float v1) {
//                if(pictureUrl.size()>currentPicture){
 //                   Glide.with(ShowActivity.this).load(pictureUrl.get(currentPicture++)).asBitmap().into(iv);
  //                  Log.w("phototap","加载完毕");
                }
            }
            @Override
            public void onOutsidePhotoTap() {
  //              Log.w("phototap","ouside");
            }
        });

或者是一个长按的监听器

ivAttacher.setOnLongClickListener(new View.OnLongClickListener() {
        @Override
        public boolean onLongClick(final View view) {
            Log.w("longclick","长按事件");
          //  Dialog dialog = new AlertDialog.Builder(ShowActivity.this).setTitle("保存?").setMessage("是否确认保存?").
          //          setPositiveButton("确认", new DialogInterface.OnClickListener()
          //          {
           //             public void onClick(DialogInterface dialog, int whichButton)
           //             {
           //                 savePicture(view);
           //                 dialog.cancel();
            //            }
            //        }).create();
            //    dialog.show();
                return true;
            }
        });

可以设置是否允许放大

ivAttacher.setZoomable(true);

 

PhotoView PhotoView aims to help produce an easily usable implementation of a zooming Android ImageView. Branch Develop: Build Status Branch Master: Build Status PhotoView Features Out of the box zooming, using multi-touch and double-tap. Scrolling, with smooth scrolling fling. Works perfectly when used in a scrolling parent (such as ViewPager). Allows the application to be notified when the displayed Matrix has changed. Useful for when you need to update your UI based on the current zoom/scroll position. Allows the application to be notified when the user taps on the Photo. Sample Application The sample application (the source is in the repository) has been published onto Google Play for easy access: Get it on Google Play Gradle Dependency Add this in your root build.gradle file (not your module build.gradle file): allprojects { repositories { ... maven { url "https://jitpack.io" } } } Then, add the library to your project build.gradle dependencies { compile 'com.github.chrisbanes:PhotoView:1.2.6' } Sample Usage There is a sample provided which shows how to use the library in a more advanced way, but for completeness here is all that is required to get PhotoView working: ImageView mImageView; PhotoViewAttacher mAttacher; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // Any implementation of ImageView can be used! mImageView = (ImageView) findViewById(R.id.iv_photo); // Set the Drawable displayed Drawable bitmap = getResources().getDrawable(R.drawable.wallpaper); mImageView.setImageDrawable(bitmap); // Attach a PhotoViewAttacher, which takes care of all of the zooming functionality. // (not needed unless you are going to change the drawable later) mAttacher = new PhotoViewAttacher(mImageView); } // If you later call mImageView.setImageDrawable/setImageBitmap/setImageResource/etc then you just need to call mAttacher.update(); Issues With ViewGroups There are some ViewGroups (ones that utilize onInterceptTouchEvent) that throw exceptions when a PhotoView is placed within them, most notably ViewPager and DrawerLayout. This is a framework issue that has not been resolved. In order to prevent this exception (which typically occurs when you zoom out), take a look at HackyDrawerLayout and you can see the solution is to simply catch the exception. Any ViewGroup which uses onInterceptTouchEvent will also need to be extended and exceptions caught. Use the HackyDrawerLayout as a template of how to do so. The basic implementation is: public class HackyProblematicViewGroup extends ProblematicViewGroup { public HackyProblematicViewGroup(Context context) { super(context); } @Override public boolean onInterceptTouchEvent(MotionEvent ev) { try { return super.onInterceptTouchEvent(ev); } catch (IllegalArgumentException e) { //uncomment if you really want to see these errors //e.printStackTrace(); return false; } } } Usage with Fresco Due to the complex nature of Fresco, this library does not currently support Fresco. See this project as an alternative solution. Subsampling Support This library aims to keep the zooming implementation simple. If you are looking for an implementation that supports subsampling, check out this project Pull Requests / Contribution Development happens in develop branch of this repository, and Pull Requests should be filled against that branch. Any Pull Request against master will be rejected License Copyright 2011, 2012 Chris Banes Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
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